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WO2010058911A2 - Procédé de transmission d'un signal de référence dans un système multiantenne - Google Patents

Procédé de transmission d'un signal de référence dans un système multiantenne Download PDF

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Publication number
WO2010058911A2
WO2010058911A2 PCT/KR2009/006130 KR2009006130W WO2010058911A2 WO 2010058911 A2 WO2010058911 A2 WO 2010058911A2 KR 2009006130 W KR2009006130 W KR 2009006130W WO 2010058911 A2 WO2010058911 A2 WO 2010058911A2
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WO
WIPO (PCT)
Prior art keywords
reference signal
antenna
data
channel
antennas
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Application number
PCT/KR2009/006130
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English (en)
Korean (ko)
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WO2010058911A3 (fr
Inventor
고현수
김소연
구자호
정재훈
한승희
이문일
Original Assignee
엘지전자주식회사
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Priority claimed from KR1020090014745A external-priority patent/KR20100058390A/ko
Application filed by 엘지전자주식회사 filed Critical 엘지전자주식회사
Publication of WO2010058911A2 publication Critical patent/WO2010058911A2/fr
Publication of WO2010058911A3 publication Critical patent/WO2010058911A3/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT

Definitions

  • MIMO technology is a method that can improve the transmission and reception data transmission efficiency by adopting multiple transmission antennas and multiple reception antennas, away from the use of one transmission antenna and one reception antenna.
  • the MIMO system is also called a multiple antenna system.
  • MIMO technology is an application of a technique of gathering and completing fragmented pieces of data received from multiple antennas without relying on a single antenna path to receive one entire message. As a result, it is possible to improve the data transfer rate in a specific range or increase the system range for a specific data transfer rate.
  • Channel estimation refers to a process of restoring a transmission signal by compensating for distortion of a signal caused by a sudden environmental change due to fading.
  • a reference signal known to both the transmitter and the receiver is required for channel estimation.
  • a reference signal transmission method includes a first reference signal corresponding to at least one antenna included in a first antenna group and at least one antenna corresponding to a second antenna group. Combining the two reference signals into one stream and transmitting a third reference signal for separating the first reference signal and the second reference signal from the stream.
  • a data processing method includes receiving a common reference signal transmitted through a virtual antenna combining a plurality of antennas, and demodulating reference for separating reference signals of each antenna from the common reference signal. Receiving a signal, and estimating a channel of each antenna by separating reference signals of each antenna by using the demodulation reference signal.
  • FIG. 1 is a block diagram illustrating a wireless communication system.
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • FIG. 3 is a block diagram illustrating a radio protocol structure for a control plane.
  • 5 shows a mapping between a downlink transport channel and a downlink physical channel.
  • FIG. 6 shows the structure of a radio frame.
  • FIG. 8 shows a structure of a subframe.
  • FIG. 10 shows an example of a common reference signal structure for two antennas.
  • FIG. 11 shows an example of a common reference signal structure for four antennas in a subframe to which a general CP is applied.
  • FIG. 12 shows an example of a common reference signal structure for four antennas in a subframe to which an extended CP is applied.
  • FIG. 13 shows an example of a dedicated RS structure in a subframe to which a general CP is applied.
  • FIG. 14 shows an example of a dedicated RS structure in a subframe to which an extended CP is applied.
  • 15 shows an example of a reference signal structure in a system using eight transmission antennas.
  • FIG. 16 illustrates a reference signal transmission method according to an embodiment of the present invention.
  • FIG. 17 illustrates a method of transmitting a reference signal using a virtualization scheme according to an embodiment of the present invention.
  • FIG. 18 illustrates a method of transmitting a reference signal using a virtualization scheme according to another embodiment of the present invention.
  • FIG. 19 shows a layout of a demodulation reference signal according to an embodiment of the present invention.
  • FIG. 20 illustrates a layout of a demodulation reference signal according to another embodiment of the present invention.
  • 21 shows a layout of a common reference signal and a demodulation reference signal according to an embodiment of the present invention.
  • FIG. 22 illustrates a layout of a common reference signal and a demodulation reference signal according to another embodiment of the present invention.
  • FIG. 1 is a block diagram illustrating a wireless communication system.
  • This may be a network structure of an Evolved-Universal Mobile Telecommunications System (E-UMTS).
  • E-UMTS Evolved-Universal Mobile Telecommunications System
  • LTE Long Term Evolution
  • Wireless communication systems are widely deployed to provide various communication services such as voice, packet data, and the like.
  • an Evolved-UMTS Terrestrial Radio Access Network includes a base station (BS) 20 that provides a control plane and a user plane.
  • BS base station
  • the UE 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a wireless device, and the like.
  • the base station 20 generally refers to a fixed station communicating with the terminal 10, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), and an access point. have.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • One base station 20 may provide a service for at least one cell.
  • the cell is an area where the base station 20 provides a communication service.
  • An interface for transmitting user traffic or control traffic may be used between the base stations 20.
  • downlink means transmission from the base station 20 to the terminal 10
  • uplink means transmission from the terminal 10 to the base station 20.
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to an Evolved Packet Core (EPC), more specifically, a Mobility Management Entity (MME) / Serving Gateway (S-GW) 30 through an S1 interface.
  • EPC Evolved Packet Core
  • MME Mobility Management Entity
  • S-GW Serving Gateway
  • Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) model, which is well known in communication systems. It may be divided into a second layer L2 and a third layer L3.
  • the first layer is a physical layer (PHY) layer.
  • the second layer may be divided into a medium access control (MAC) layer, a radio link control (RLC) layer, and a packet data convergence protocol (PDCP) layer.
  • the third layer is a Radio Resource Control (RRC) layer.
  • the wireless communication system may be an Orthogonal Frequency Division Multiplexing (OFDM) / Orthogonal Frequency Division Multiple Access (OFDMA) based system.
  • OFDM uses multiple orthogonal subcarriers.
  • OFDM uses orthogonality between inverse fast fourier transforms (IFFTs) and fast fourier transforms (FFTs).
  • IFFTs inverse fast fourier transforms
  • FFTs fast fourier transforms
  • the transmitter performs IFFT on the data and transmits it.
  • the receiver recovers the original data by performing an FFT on the received signal.
  • the transmitter uses an IFFT to combine multiple subcarriers, and the receiver uses a corresponding FFT to separate multiple subcarriers.
  • the wireless communication system may be a multiple antenna system.
  • the multiple antenna system may be a multiple-input multiple-output (MIMO) system.
  • the multi-antenna system may be a multiple-input single-output (MISO) system or a single-input single-output (SISO) system or a single-input multiple-output (SIMO) system.
  • MISO multiple-input single-output
  • SISO single-input single-output
  • SIMO single-input multiple-output
  • the MIMO system uses multiple transmit antennas and multiple receive antennas.
  • the MISO system uses multiple transmit antennas and one receive antenna.
  • the SISO system uses one transmit antenna and one receive antenna.
  • the SIMO system uses one transmit antenna and multiple receive antennas.
  • Techniques that use multiple antennas in multiple antenna systems include space-time coding (STC) such as Space Frequency Block Code (SFBC), Space Time Block Code (STBC), Cyclic Delay Diversity (CDD), and frequency switched (FSTD) in rank 1. transmit diversity), time switched transmit diversity (TSTD), or the like may be used.
  • STC space-time coding
  • SFBC Space Frequency Block Code
  • STBC Space Time Block Code
  • CDD Cyclic Delay Diversity
  • FSTD frequency switched
  • transmit diversity time switched transmit diversity
  • TSTD time switched transmit diversity
  • SSTD time switched transmit diversity
  • SFBC spatial multiplexing
  • GCDD Generalized Cyclic Delay Diversity
  • S-VAP Selective Virtual Antenna Permutation
  • SFBC is a technique that efficiently applies selectivity in the spatial domain and frequency domain to secure both diversity gain and multi-user scheduling gain in the corresponding dimension.
  • STBC is a technique for applying selectivity in the space domain and the time domain.
  • FSTD is a technique for dividing a signal transmitted through multiple antennas by frequency
  • TSTD is a technique for dividing a signal transmitted through multiple antennas by time.
  • Spatial multiplexing is a technique to increase the data rate by transmitting different data for each antenna.
  • GCDD is a technique for applying selectivity in the time domain and the frequency domain.
  • S-VAP is a technique using a single precoding matrix.
  • Multi-codeword (MCW) S which mixes multiple codewords between antennas in spatial diversity or spatial multiplexing
  • SCW Single Codeword
  • FIG. 2 is a block diagram illustrating a radio protocol architecture for a user plane.
  • 3 is a block diagram illustrating a radio protocol structure for a control plane. This shows the structure of the air interface protocol between the terminal and the E-UTRAN.
  • the user plane is a protocol stack for user data transmission
  • the control plane is a protocol stack for control signal transmission.
  • data is moved through physical channels between different physical layers, that is, between physical layers of a transmitting side and a receiving side.
  • the physical layer is connected to the upper MAC layer through a transport channel. Data is transferred between the MAC layer and the physical layer through a transport channel.
  • the physical layer provides an information transfer service to a MAC layer and a higher layer using a transport channel.
  • the MAC layer provides a service to an RLC layer, which is a higher layer, through a logical channel.
  • the RLC layer supports the transmission of reliable data.
  • the PDCP layer performs a header compression function that reduces the IP packet header size.
  • the RRC layer is defined only in the control plane.
  • the RRC layer serves to control radio resources between the terminal and the network. To this end, the RRC layer exchanges RRC messages between the UE and the network.
  • the RRC layer is responsible for controlling logical channels, transport channels, and physical channels in connection with configuration, re-configuration, and release of radio bearers.
  • the radio bearer refers to a service provided by the second layer for data transmission between the terminal and the E-UTRAN. If there is an RRC connection (RRC Connection) between the RRC of the terminal and the RRC of the network, the terminal is in the RRC Connected Mode, otherwise it is in the RRC Idle Mode.
  • the non-access stratum (NAS) layer located above the RRC layer performs functions such as session management and mobility management.
  • mapping between a downlink logical channel and a downlink transport channel This includes: 3GPP TS 36.300 V8.6.0 (2008-09) Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; See section 6.1.3.2 of Stage 2 (Release 8).
  • a paging control channel is mapped to a paging channel (PCH), and a broadcast control channel (BCCH) is mapped to a broadcast channel (BCH) or a downlink shared channel (DL-SCH).
  • Common Control Channel CCCH
  • DCCH Dedicated Control Channel
  • DTCH Dedicated Traffic Channel
  • MCCH Multicast Control Channel
  • MTCH Multicast Traffic Channel
  • Each logical channel type is defined by what kind of information is transmitted. There are two types of logical channels: control channels and traffic channels.
  • the control channel is a channel for transmitting control plane information.
  • BCCH is a downlink channel for broadcasting system control information.
  • PCCH is a downlink channel that transmits paging information and is used when the network does not know the location of the terminal.
  • CCCH is a channel for transmitting control information between the terminal and the network, and is used when there is no RRC connection between the terminal and the network.
  • the MCCH is a point-to-multipoint downlink channel used to transmit multimedia broadcast multicast service (MBMS) control information.
  • DCCH is a point-to-point bidirectional channel for transmitting dedicated control information between a terminal and a network, and is used by a terminal having an RRC connection.
  • Transport channels are classified according to the way data is transmitted over the air interface.
  • the BCH has a predefined transmission format that is broadcast and fixed in the entire cell area.
  • DL-SCH supports HARQ (Hybrid Automatic Repeat reQuest), support for dynamic link adaptation by changing modulation, coding and transmission power, possibility of broadcast, possibility of beamforming, and dynamic / semi-static resources. It is characterized by support for allocation, support for DRX (Discontinuous Reception) for MB power saving, and support for MBMS transmission.
  • PCH is characterized by DRX support for terminal power saving and broadcast to the entire cell area.
  • the MCH is characterized by broadcast to the entire cell area and MBMSN (MBMS Single Frequency Network) support.
  • MBMSN MBMS Single Frequency Network
  • a BCH is mapped to a physical broadcast channel (PBCH)
  • an MCH is mapped to a physical multicast channel (PMCH)
  • a PCH and a DL-SCH are mapped to a physical downlink shared channel (PDSCH).
  • PBCH carries a BCH transport block
  • PMCH carries an MCH
  • PDSCH carries a DL-SCH and a PCH.
  • the downlink physical control channel used in the physical layer includes a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), and the like.
  • the PDCCH informs the UE about resource allocation of the PCH and DL-SCH and HARQ information related to the DL-SCH.
  • the PDCCH may carry an UL scheduling grant that informs the UE of resource allocation of uplink transmission.
  • the PCFICH informs the UE of the number of OFDM symbols used for transmission of the PDCCH in a subframe. PCFICH may be transmitted for each subframe.
  • the PHICH carries HARQ ACK / NAK signals in response to uplink transmission.
  • a radio frame may consist of 10 subframes, and one subframe may consist of two slots. Slots in a radio frame are numbered slots 0 through 19. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). TTI may be referred to as a scheduling unit for data transmission. For example, one radio frame may have a length of 10 ms, one subframe may have a length of 1 ms, and one slot may have a length of 0.5 ms.
  • the structure of the radio frame is merely an example, and the number of subframes included in the radio frame or the number of slots included in the subframe may be variously changed.
  • a downlink slot includes a plurality of OFDM symbols in a time domain and N DL resource blocks (RBs) in a frequency domain.
  • the number NDL of resource blocks included in a downlink slot depends on a downlink transmission bandwidth set in a cell.
  • the NDL may be any one of 60 to 110.
  • One resource block includes a plurality of subcarriers in the frequency domain.
  • Each element on the resource grid is called a resource element.
  • Resource elements on the resource grid may be identified by index pairs (k, l) in the slot.
  • an example of one resource block includes 7 ⁇ 12 resource elements including 7 OFDM symbols in the time domain and 12 subcarriers in the frequency domain, but the number of OFDM symbols and the number of subcarriers in the resource block is equal to this. It is not limited.
  • the number of OFDM symbols and the number of subcarriers can be variously changed according to the length of a cyclic prefix (CP), frequency spacing, and the like. For example, the number of OFDM symbols is 7 for a normal CP and the number of OFDM symbols is 6 for an extended CP.
  • the number of subcarriers in one OFDM symbol may be one of 128, 256, 512, 1024, 1536, and 2048.
  • FIG. 8 shows a structure of a subframe.
  • a subframe includes two consecutive slots.
  • the first 3 OFDM symbols of the first slot in the subframe are the control region to which the PDCCH is allocated, and the remaining OFDM symbols are the data region to which the PDSCH is allocated.
  • the control region may be allocated a control channel such as PCFICH and PHICH.
  • the UE may read the data information transmitted through the PDSCH by decoding the control information transmitted through the PDCCH.
  • the control region includes only 3 OFDM symbols, and the control region may include 2 OFDM symbols or 1 OFDM symbol.
  • the number of OFDM symbols included in the control region in the subframe can be known through the PCFICH.
  • a resource element used for transmitting a reference signal is referred to as a reference symbol.
  • Resource elements except for reference symbols may be used for data transmission.
  • Resource elements used for data transmission are called data symbols.
  • N CP 1 in the general CP and 0 in the extended CP.
  • the generated common RS sequence is mapped to a resource element.
  • Equation 4 shows an example in which a common RS sequence is mapped to a resource element.
  • the common reference signal sequence may be mapped to complex-valued modulation symbols a k, l (P) for antenna p in slot n s .
  • ⁇ and ⁇ shift are defined as positions in the frequency domain for different reference signals.
  • ⁇ may be given by Equation 5.
  • FIG. 13 shows an example of a dedicated RS structure in a subframe to which a general CP is applied.
  • 14 shows an example of a dedicated RS structure in a subframe to which an extended CP is applied.
  • the dedicated reference signal is transmitted as many as the number of streams.
  • the dedicated reference signal may be used when the base station beamforms and transmits downlink information to a specific terminal.
  • the dedicated reference signal may not be included in the control region but may be included in the data region.
  • the dedicated reference signal may be transmitted through a resource block to which a PDSCH is mapped. That is, a dedicated reference signal for a specific terminal is transmitted through a PDSCH assigned to the specific terminal.
  • 15 shows an example of a reference signal structure in a system using eight transmission antennas.
  • a reference signal for separating the reference signal of the first antenna group and the reference signal of the second antenna group is included in the data area allocated to the developed terminal and transmitted.
  • a reference signal for separating the reference signal of the first antenna group and the reference signal of the second antenna group is a demodulation reference signal (decoding RS, DRS) for data demodulation.
  • the virtualization technique may perform decoding as in the 4Tx system even when the terminal of the 4Tx supporting system enters the 8Tx system.
  • a reference signal of 8Tx may be arranged in the same manner as a reference signal of 4Tx.
  • 19 shows a layout of a demodulation reference signal according to an embodiment of the present invention.
  • 20 illustrates a layout of a demodulation reference signal according to another embodiment of the present invention.
  • 19 shows a downlink resource block of the FDD scheme
  • FIG. 20 shows a downlink resource block of the TDD scheme.
  • the demodulation reference signal When a demodulation reference signal is added, data throughput decreases by that much. Considering the loss of data throughput of approximately 10%, the demodulation reference signal may be arranged as shown in Table 1 in one resource block.

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  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de transmission d'un signal de référence qui comprend les étapes suivantes: le couplage d'un premier signal de référence adapté à au moins une première antenne faisant partie d'un premier groupe d'antennes et d'un second signal de référence adapté à au moins une antenne faisant partie d'un second groupe d'antennes, et la transmission, dans un unique flux, des signaux couplés; suivie par la transmission d'un troisième signal de référence pour séparer le premier signal de référence et le second signal de référence présents dans le flux. La présente invention permet de réduire les surdébits provoqués par les signaux de référence adaptés à chacune des antennes et de transmettre de manière adaptative les signaux de référence en fonction du niveau d'efficacité du matériel de terminal dans le système multiantenne.
PCT/KR2009/006130 2008-11-23 2009-10-22 Procédé de transmission d'un signal de référence dans un système multiantenne WO2010058911A2 (fr)

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US11722608P 2008-11-23 2008-11-23
US61/117,226 2008-11-23
KR10-2009-0014745 2009-02-23
KR1020090014745A KR20100058390A (ko) 2008-11-23 2009-02-23 다중안테나 시스템에서 참조신호 전송방법

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9537623B2 (en) 2011-03-31 2017-01-03 Alcatel Lucent Method, apparatus, base station and user equipment for reducing interference in a wireless communication system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030007481A (ko) * 2000-03-30 2003-01-23 콸콤 인코포레이티드 채널 상태 정보를 측정하기 위한 방법 및 장치
WO2005057870A1 (fr) * 2003-12-05 2005-06-23 Qualcomm Incorporated Systeme a antennes multiples conçu pour fonctionner simultanement avec des recepteurs miso et mimo
KR20080054164A (ko) * 2006-12-12 2008-06-17 엘지전자 주식회사 참조 신호 전송, 참조 신호 전송 패턴 설정, 자원 블록설정 및 할당을 위한 방법 및 장치

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20030007481A (ko) * 2000-03-30 2003-01-23 콸콤 인코포레이티드 채널 상태 정보를 측정하기 위한 방법 및 장치
WO2005057870A1 (fr) * 2003-12-05 2005-06-23 Qualcomm Incorporated Systeme a antennes multiples conçu pour fonctionner simultanement avec des recepteurs miso et mimo
KR20080054164A (ko) * 2006-12-12 2008-06-17 엘지전자 주식회사 참조 신호 전송, 참조 신호 전송 패턴 설정, 자원 블록설정 및 할당을 위한 방법 및 장치

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9537623B2 (en) 2011-03-31 2017-01-03 Alcatel Lucent Method, apparatus, base station and user equipment for reducing interference in a wireless communication system

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